Wellbore fluids and their application
AssigneeSchlumberger Technology Corporation
InventorsBentley J. Palmer, Diankui Fu, Roger Card, Edgar Volpert
Life of this patent
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Abstract
Non-aqueous base wellbore fluids characterized by enhanced electrical conductivity due to formulation with specified ionic liquids are disclosed. Drilling, completion, and workover methods utilizing the wellbore fluids are also disclosed.
Claims33
A wellbore fluid of increased electrical conductivity comprising a non-aqueous base liquid selected from the group consisting of oil, refined fractions from oil, n-paraffins, alpha-olefins, internal olefins, poly-alpha-olefins, dialkyl ethers, natural oils, and mixtures thereof, containing an effective concentration of cations and anions from a water stable hydrophobic ionic liquid, and wherein said anions are selected from the group consisting of BF4−;
- PF6−;
- SbF6−;
- CF3SO3−;
- CuCl2−;
- Cu2Cl3−;
- Cu3Cl4−;
- NO3−;
- (CF3SO2)2N−;
- Br−;
- ClO4−;
- CH3COO−;
- and BPh4−.
A non-aqueous base wellbore fluid of increased conductivity comprising a fluid formed by blending a non-aqueous base liquid selected from the group consisting of oil, refined fractions from oil, n-paraffins, alpha-olefins, internal olefins, poly-alpha-olefins, dialkyl ethers, natural oils, and mixtures thereof, with an effective amount of a water stable hydrophobic ionic liquid, wherein the anions of said ionic liquid are selected from the group consisting of BF4−;
- PF6−;
- SbF6−;
- CF3SO3−;
- CuCl2−;
- Cu2Cl3−;
- Cu3Cl4−;
- NO3−;
- (CF3SO2)2N−;
- Br−;
- ClO4−;
- CH3COO−;
- and BPh4−.
A non-aqueous base wellbore fluid of increased conductivity comprising a single phase mixture of a non-aqueous base liquid and a minor amount of a second, different organic solvent liquid, or mixture thereof, soluble in the non-aqueous base liquid, containing an effective concentration of cations and anions from a water stable hydrophobic ionic liquid.
In a method of drilling a well in which a drill bit is rotated in a wellbore while circulating a drilling fluid in the wellbore as the wellbore is formed, the improvement comprising using as the drilling fluid a non-aqueous base drilling fluid of increased conductivity containing an effective concentration of cations and anions from a water stable hydrophobic ionic liquid.
In a method of completion of a well in which a completion fluid is employed in the wellbore during completion of the well, the improvement comprising using as the completion fluid a completion fluid of increased electrical conductivity comprising a non-aqueous base liquid selected from the group consisting of oil, refined fractions from oil, n-paraffins, alpha-olefins, internal olefins, poly-alpha-olefins, dialkyl ethers, natural oils, and mixtures thereof, containing an effective concentration of cations and anions from a water stable hydrophobic ionic liquid, and wherein said anions are selected from the group consisting of BF4−;
- PF6−;
- SbF6−;
- CF3SO3−;
- CuCl2−;
- Cu2Cl3−;
- Cu3Cl4−;
- NO3−;
- (CCF3SO2)2N−;
- Br−;
- ClO4−;
- CH3COO−;
- and BPh4−.
In a method of workover of a well in which a workover fluid is employed in the wellbore during workover of the well, the improvement comprising using as the workover fluid a workover fluid of increased electrical conductivity comprising a non-aqueous base liquid selected from the group consisting of oil, refined fractions from oil, n-paraffins, alpha-olefins, internal olefins, poly-alpha-olefins, dialkyl ethers, natural oils, and mixtures thereof, containing an effective concentration of cations and anions from a water stable hydrophobic ionic liquid, and wherein said anions are selected from the group consisting of BF4−;
- PF6−;
- SbF6−;
- CF3SO3−;
- CuCl2−;
- Cu2Cl3−;
- Cu3Cl4−;
- NO3−;
- (CCF3SO2)2N−;
- Br−;
- ClO4−;
- CH3COO−;
- and BPh4−.
A method of drilling a well comprising drilling a well in a subterranean formation while circulating a drilling fluid in the wellbore as the well is drilled, the drilling fluid comprising a non-aqueous base drilling fluid of increased conductivity containing an effective concentration of cations and anions from a water stable hydrophobic ionic liquid.
A method comprising conducting completion activity in a well in a subterranean formation while providing a completion fluid in the wellbore, the completion fluid comprising a completion fluid of increased electrical conductivity comprising a non-aqueous base liquid selected from the group consisting of oil, refined fractions from oil, n-paraffins, alpha-olefins, internal olefins, poly-alpha-olefins, dialkyl ethers, natural oils, and mixtures thereof, containing an effective concentration of cations and anions from a water stable hydrophobic ionic liquid, and wherein said anions are selected from the group consisting of BF4−;
- PF6−;
- SbF6−;
- CF3SO3−;
- CuCl2−;
- Cu2Cl3−;
- Cu3Cl4−;
- NO3−;
- (CCF3SO2)2N−;
- Br−;
- ClO4−;
- CH3COO−;
- and BPh4−.
A method for workover of a well comprising conducting the workover of a well in a subterranean formation while providing a workover fluid in the wellbore, the workover fluid comprising a workover fluid of increased electrical conductivity comprising a non-aqueous base liquid selected from the group consisting of oil, refined fractions from oil, n-paraffins, alpha-olefins, internal olefins, poly-alpha-olefins, dialkyl ethers, natural oils, and mixtures thereof, containing an effective concentration of cations and anions from a water stable hydrophobic ionic liquid, and wherein said anions are selected from the group consisting of BF4−;
- PF6−;
- SbF6−;
- CF3SO3−;
- CuCl2−;
- Cu2Cl3−;
- Cu3Cl4−;
- NO3−;
- (CF3SO2)2N−;
- Br−;
- ClO4−;
- CH3COO−;
- and BPh4−.
In the development of a source of oil or gas in a subterranean formation by wellbore operations using a wellbore fluid, the improvement comprising providing in the wellbore as the wellbore fluid a wellbore fluid of increased electrical conductivity comprising a non-aqueous base liquid selected from the group consisting of oil, refined fractions from oil, n-paraffins, alpha-olefins, internal olefins, poly-alpha-olefins, dialkyl ethers, natural oils, and mixtures thereof, containing an effective concentration of cations and anions from a water stable hydrophobic ionic liquid, and wherein said anions are selected from the group consisting of BF4−;
- PF6−;
- SbF6−;
- CF3SO3−;
- CuCl2−;
- Cu2Cl3−;
- Cu3Cl4−;
- NO3−;
- (CCF3SO2)2N−;
- Br−;
- ClO4−;
- CH3COO−;
- and BPh4−.
Dependencies are inferred from the claim text.